Sorry for late reply, just stumbled on your post! I hope you did some more research and you're chicken is better! My chick had the same symptoms, I searched the internet trying to find a explanation for my sleepy chicken and finally found the answer from this forum http://www.backyardchickens.com/a/coccidiosis-how-to-treat-it
It could also be worms, but sounds more like Coccidiosis. Good idea to worm them before they start laying anyways!
I took my chicken to a avain (bird) vet and he gave me some medicine to put in all the chooks water along with a worming solution and my sleepy chick (noddy) is now 10 months old, healthy and loving life!
Oh and the back yard chickens website is fantastic, have a look around, especially if your new to keeping chooks!